Loud-speaker



July 2a, 1942.

L. IGLUCK LOUD SPEAKER Filed Sept. 6, 1940 \W C. c 2

. Ls f 7 c.[eqbald 6/0 Inventor:

Patented July 28, 1942 LOUD-SPEAKER Leopold Igliick, Berlin, Germany, assignor to C. Lorenz Aktien'gesellschaft, Berlin-Tempelhof, Germany, a company Application September 6, 1940, Serial No. 355,621

- In Germany November 3, 1939 2 Claims.

Loudspeakers installed on shipboard or in tankstations, damp rooms or the like, being fixed there to the ceiling, for instance, require their operative system to be protected from water and moisture. For this purpose the system is enclosed in a water-tight metal casing. The protection aflorded in this way, however, is not suflicient since there is no provision for closing the sound hole of the casing.

The present invention provides for closing the sound hole by means of the sound distributing body located in front thereof.

arranged in the open air or in damp rooms.

The drawing shows one embodiment of the invention. Fig. 1 is a sectional view, taken along line ll of Fig. 2, and Fig. 2 a plan view of this embodiment.

The casing I for the loudspeaker LS is made of sound-proof material and has a flange 2 pierced with holes for fixing the loudspeaker to the ceiling C of the respective room. The sound hole ll of the casing can be closed by the sound distributing body or cone 3, as indicated in dotted lines.

In the case here illustrated by way of example a cylindrical bar 4 is attached to body 3 and has a handwheel or other suitable handle 5 rigidly fixed to it. Bar 4 is formed with a screw i body 3.

The invention thus serves to increase the life of loudspeakers adapted to engage with a thread 1 provided in a. sleeve 8. This sleeve is fixed to props 9 of the casing i and serves as a guide for bar 4 and In order to close the opening II by means of the body 3 the assembly 5, 6, 4, 3 is raised until the thread 6 comes against thread 1. Thread 6 is then screwed into the thread I with the aid of wheel 5, whereby the edge of body 3 is pressed against the edge 0'! the hole ll. Body 3 may be providedto such end with an annular rubber joint l0.

What is claimed is:

1. A waterproof housing for a loud speaker comprising, in combination, a waterproof casing enclosing said loud speaker, said casing having a sound opening therein, and a sound distributing body movably mounted in front of said sound opening and being movable into position against said casing to seal said sound opening against entry of moisture into said casing.

2. In a combination according to claim 1, a guide for the sound distributing body, a threaded member forming part of this guide, a handle carried by the sound distributing body, and a threaded member fitted to such handle and adapted to engage with the threadedmember of said guide.

' LEOPOLD IGLticK. 

